Invention Grant
- Patent Title: Electronic circuit for driving LED strings including a plurality of regulation modules which function in sequence
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Application No.: US15604811Application Date: 2017-05-25
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Publication No.: US09918364B2Publication Date: 2018-03-13
- Inventor: Davide Lena , Simone Crespi
- Applicant: STMicroelectronics S.r.l.
- Applicant Address: IT Agrate Brianza
- Assignee: STMicroelectronics S.r.l.
- Current Assignee: STMicroelectronics S.r.l.
- Current Assignee Address: IT Agrate Brianza
- Agency: Gardere Wynne Sewell LLP
- Main IPC: H05B33/08
- IPC: H05B33/08

Abstract:
An electronic circuit drives a plurality of LED strings connected in series. The electronic circuit includes a regulation module corresponding to each LED string, with the regulation module connected to the cathode terminal of the corresponding LED string. Each regulation module is further coupled to receive a reference voltage in phase with a rectified a.c. voltage. The regulation modules execute in turn and in sequence a current-regulation phase as a function of a trend of the reference voltage. Each regulation module, when executing the current-regulation phase, functions to regulate the current that flows in the corresponding LED string and in any previous LED strings in the series connection so that the regulated current is proportional to the reference voltage.
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